Vacuum delay/relief valve
US4010721A · kind A · utility
8Cited by
5References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1975 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Apr 24, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7847
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A device for use in an internal combustion engine for reducing emissions and for improving engine performance and economy having valve means for restricting air flow from the carburetor spark port to the vacuum advance cylinder at moderate acceleration to delay spark retard and for permitting unrestricted air flow at substantially full throttle acceleration to provide normal spark retard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.